- 标题
- 摘要
- 关键词
- 实验方案
- 产品
-
Micro-structured optical fiber magnetic field sensor based on magnetic fluid filling
摘要： A novel micro-structured fiber magnetic field sensor based on magnetic fluid (MF) filling is proposed. The air hole radius in the cladding of fiber is reduced from inner layer to outer layer, and the numerical analysis is performed by the finite element method (FEM). For the x-pol mode, the proposed sensor has an average sensitivity of 960.61 pm/Oe, and for the y-pol mode, the average sensitivity can reach 884.85 pm/Oe. The sensor has the advantages of small size and high sensitivity and is competitive in magnetic field sensors.
关键词： magnetic fluid,sensor,Micro-structure optical fiber
更新于2025-09-11 14:15:04
-
Optical fiber-based manipulation of microparticles in microfluidic channel through thermal convection
摘要： We demonstrate a simple optical fiber microfluidic control device based on photothermal effect induced convection, which can realize flexible manipulation and particle sorting in range of hundreds of microns. Three single-mode optical fibers arranged regularly were utilized for the realization of the particle capture function, which simplifies the complex equipment and reduces the cost in traditional optical tweezers. We also display a unique control mode: horizontal manipulation of particles by moving the fiber vertically. It is hopefully to be applied in biomedical, chemical analysis, material testing and other fields.
关键词： optical fiber,photothermal effect,trapping,microfludic
更新于2025-09-11 14:15:04
-
Stress distribution characteristics of the optical fiber with multiple stress elements
摘要： The stress field in an optical fiber with one circular stress element is calculated theoretically. The stress field distribution for any optical fiber with multiple stress elements is derived based on the superposition theorem and the integration method. As is shown in this paper, the stress field in the core or in the region near core can be expressed by a formula with sine or cosine function. This result is important to reveal the coupling characteristics of the stress induced optical fiber with multiple stress elements when it is spun by an appropriate spinning rate.
关键词： Optical fiber,Multiple stress elements,Integration method,Stress field,Superposition theorem
更新于2025-09-11 14:15:04
-
[IEEE 2019 41st Annual International Conference of the IEEE Engineering in Medicine & Biology Society (EMBC) - Berlin, Germany (2019.7.23-2019.7.27)] 2019 41st Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC) - Optical fiber sensors for monitoring in critical care
摘要： Monitoring of key physiological and pharmacological parameters is an important part of a closed loop control system in critical care. Optical fiber sensors provide a versatile platform technology that can be easily incorporated into existing in-dwelling catheters or face masks. With appropriate functional coatings they can be used to monitor a range of relevant parameters and two different examples are presented: (i) respiration monitoring; (ii) drug level monitoring. Respiration monitoring involves monitoring of temperature and humidity in inhaled and exhaled breath. The optical fiber sensor consists of a fiber Bragg grating to measure temperature and a tip coating whose refractive index changes with humidity. The sensor is demonstrated to be able to track breath to breath changes when incorporated into a mask. Drug level monitoring is demonstrated in vitro using a long period grating coated with molecularly imprinted polymer nanoparticles that are sensitive to fentanyl. The sensor has a limit of detection of 50ng/ml.
关键词： respiration monitoring,optical fiber sensors,drug level monitoring,critical care,fentanyl
更新于2025-09-11 14:15:04
-
Modeling and Optimization of a Cost-efficient Distributed Temperature Sensor Based on Temperature Sensitive Optical Fibers
摘要： A cost-efficient distributed temperature sensor based on Rayleigh scattering in temperature sensitive optical fibers was proposed. The temperature dependence of commercial off-the-shelf single mode fiber was analyzed. By combining a temperature dependent model of the sensitive fibers and loss resolution model of optical time domain reflectometer, a general sensor model has been developed. In order to optimize the temperature resolution, the length of each sensing segment and the overall sensing distance, three models are derived from the general model. Based on the models and parameters optimization, a novel design method is proposed. Using the method, a prototype was built and tested. The test results indicate that the temperature resolution is better than 1 °C in the temperature range from -40 °C to 150 °C, which is consistent with the optimal results.
关键词： temperature sensitive optical fiber,modeling optimization,Distributed temperature sensor
更新于2025-09-11 14:15:04
-
Implications of theoretical analysis to explore the functional core dimension in one-rod core microstructured optical fibers
摘要： A new development in optical fiber technology that has attracted interest for multitude of novel and potential applications is an all-in-silica microstructured optical fibre (MOF) with one-rod core. We aim to estimate the functional core dimension for one-rod core triangular MOF (T-MOF) from its geometrical characteristics by using an alternative analytical field model. Moreover, to scrutinize the validity of the choice of effective core dimension (by adapting V-parameter, i.e., the normalized frequency) for T-MOF, we have explored the rudimentary propagation characteristics of the T-MOF in single mode guidance realm. We made comparisons with those which are based on the experimental and numerical studies. Relative errors are also reported.
关键词： One-rod core,Fundamental mode,Microstructured optical fiber,Effective index,Optimization,Single mode
更新于2025-09-11 14:15:04
-
Effect of Below-Freezing Temperature on Optical Loss of Polyimide-Coated Optical Fibers
摘要： An increase in the optical loss in polyimide-coated optical fibers, caused by microbendings is detected at temperatures below –25 ?C. It is shown that the observed increase in the optical loss is due to the presence of a residual N-methyl-2-pyrrolidone solvent in the polyimide coating.
关键词： polyimide varnish,protective–strengthening coating,optical fiber
更新于2025-09-11 14:15:04
-
Resonant Piezoelectroluminescent Fiber-Optical Sensor of a Temperature Field in Composite Structures
摘要： A dynamic mathematical model of functionation of a fiber-optical sensor in the process of resonant diagnosing of a temperature field inhomogeneous along the longitudinal axis of the sensor is developed. The resonant approach is based on a given amplitude-frequency characteristic of forced stationary electroelastic vibrations of a local section of the sensor caused by the action of the harmonic component of controlling voltage (CCV) on its electrodes; the constant CCV is necessary for tuning the sensor to the operating mode in the range of temperatures considered. The density distribution function of temperature along the sensor is found by solving the Fredholm integral equation of the first kind using the measured values of derivative with respect to the frequency of the harmonic CCV of the function of the amplitude of intensity of glow at the exit of the fiber-optical sensor. A method for resonant scanning of an ina uniform temperature field along the longitudinal axis of the sensor is developed; the method uses a new algorithm for processing the intensity of informative light signals at the exit from the optical fiber for various frequencies of the harmonic CCV. Results of a numerical modeling of the function of intensity of light pulses at the exit from the fiber-optical sensor, of the distribution of voltage amplitudes on the electroluminescent layer and of resonance frequencies along the sensor axis are presented for diagnosing an inhomogeneous model temperature field.
关键词： light intensity,mechanoluminescence effect,piezoresonator,Fredholm integral equation,optical fiber,numerical modeling,piezoelectroelasticity,temperature sensor
更新于2025-09-11 14:15:04
-
Polydopamine-Assisted Fabrication of Stable Silver Nanoparticles on Optical Fiber for Enhanced Plasmonic Sensing
摘要： We present a facile and effective method for fabrication of the localized surface plasmon resonance (LSPR) optical fiber sensor assisted by two polydopamine (PDA) layers with enhanced plasmonic sensing performance. The first PDA layer was self-polymerized onto the bare optical fiber to provide the catechol groups for the reduction from Ag+ to Ago through chelating and redox activity. As the reduction of Ag+ proceeds, Ag nanoparticles (NPs) were grown in-situ on the PDA layer with uniform distribution. The second PDA layer was applied to prevent Ag NPs from oxidating and achieve an improvement of LSPR signal. The PDA/Ag/PDA-based optical fiber sensor has an enhanced LSPR sensitivity of 961 nm/RIU and excellent oxidation resistance. The stable PDA/Ag/PDA-based LSPR sensor with high optical performance is very promising for future application in optical sensing field.
关键词： silver nanoparticles,in-situ growth,optical fiber,LSPR,polydopamine
更新于2025-09-11 14:15:04
-
A High Sensitivity Optical Fiber Sensor for GIS Partial Discharge Detection
摘要： We propose a high sensitivity optical fiber sensor for detecting the acoustic emission generated by the partial discharge in gas-insulated-switchgear (GIS). A model is established to investigate the effects of the cylinder coil on the sensitivity, the bandwidth and the detection limit. After that, the proposed sensor was modified based on the effects. The average sensitivity of the optimized acoustic emission (AE) optical fiber sensor is 32 dB higher than that of the conventional lead zirconate titanate (PZT) in the frequency range from 20 kHz to 100 kHz. Moreover, experiment results show that the detectable partial discharge initial voltage for the proposed optical system is 17.1 % lower than that for the PZT system, and the amplitude of the signal detected by the proposed optical system is 525 % higher than that detected by the PZT system.
关键词： Michelson interferometer,GIS,partial discharge,cylinder coil effects,optical fiber sensor
更新于2025-09-11 14:15:04